.. py:function:: polar_vector(gpt_magnitude, gpt_dir)
Combines two single-parameter :class:`Geopoints` into a new :class:`Geopoints` of 'polar_vector' type.
:param gpt_magnitude: geopoints containing the magnitude values
:type gpt_magnitude: :class:`Geopoints`
:param gpt_dir: geopoints containing the direction values
:type gpt_dir: :class:`Geopoints`
:rtype: :class:`Geopoints` of 'polar_vector' type.
``gpt_magnitude`` and ``gpt_dir`` should contain the same number of points.
.. mv-minigallery:: polar_vector